Genetic Diversity and Population Divergence of a Rare, Endemic Grass (Elymus breviaristatus) in the Southeastern Qinghai-Tibetan Plateau
Genetic Diversity and Population Divergence of a Rare, Endemic Grass (Elymus breviaristatus) in the Southeastern Qinghai-Tibetan Plateau
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青藏高原东南部一种珍稀特有禾本科植物（披碱草）的遗传多样性和种群分化
DOI：
10.3390/su11205863
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发表时间：
2019-10
期刊：
影响因子：
3.9
通讯作者：
Shiqie Bai
中科院分区：
文献类型：
--
作者：
Qingqing Yu;Qian Liu;Yi Xiong;Yanli Xiong;Dong Zhixiao;Yang Jian;Liu Wei;Ma Xiao;Shiqie Bai
短柄草是青藏高原东南部特有的草种，其生境破碎化严重。因此，了解天然E. breviaristatus种群可以为未来的保护策略提供见解。本研究采用序列相关扩增多态性标记技术，对7个E.来自中国QTP的短尾目种群。遗传多样性的多重测量表明，在E。breviaristatus人口，符合其假定的交配系统。尽管它的稀有性，E。短芒种具有较高的遗传多样性，与广布种相当，甚至高于广布种。贝叶斯聚类方法，沿着聚类分析和主坐标分析的研究群体划分。breviaristatus分为五个遗传簇。微分系数（Fst、GST等）AMOVA分析表明，不同群体间存在较大的遗传分化。BARRIER分析表明，在E. breviaristatus种群。尽管这些模式的分化，种群之间的遗传距离是独立的地理距离（r = 0.2197，p = 0.2534），表明距离隔离。此外，尽管通过两种方法检测到一个共同的离群值，生物气候因素（海拔高度，年平均温度，年平均降水量）与多样性参数无关，表明环境造成的隔离证据很少。这些多样性的格局内和种群之间的被用来提出一个保护策略，E。短毛状。
Elymus breviaristatus is a grass species only distributed in the southeast of Qinghai-Tibetan Plateau (QTP), which has suffered from serious habitat fragmentation. Therefore, understanding patterns of genetic diversity within and among natural E. breviaristatus populations could provide insight for future conservation strategies. In this study, sequence-related amplified polymorphism markers were employed to investigate the genetic diversity and hierarchical structure of seven E. breviaristatus populations from QTP, China. Multiple measures of genetic diversity indicated that there is low to moderate genetic variation within E. breviaristatus populations, consistent with its presumed mating system. In spite of its rarity, E. breviaristatus presented high genetic diversity that was equivalent to or even higher than that of widespread species. Bayesian clustering approaches, along with clustering analysis and principal coordinate analysis partitioned the studied populations of E. breviaristatus into five genetic clusters. Differentiation coefficients (Fst, GST, etc.) and AMOVA analysis revealed considerable genetic divergence among different populations. BARRIER analyses indicated that there were two potential barriers to gene flow among the E. breviaristatus populations. Despite these patterns of differentiation, genetic distances between populations were independent of geographic distances (r = 0.2197, p = 0.2534), indicating little isolation by distance. Moreover, despite detecting a common outlier by two methods, bioclimatic factors (altitude, annual mean temperature, and annual mean precipitation) were not related to diversity parameters, indicating little evidence for isolation caused by the environment. These patterns of diversity within and between populations are used to propose a conservation strategy for E. breviaristatus.
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影响因子：
2.9
作者：
Li BJ;Wang JY;Liu ZJ;Zhuang XY;Huang JX
通讯作者：
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影响因子：
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通讯作者：
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作者：
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通讯作者：
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